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30 .Nd playback a pcap file through a netmap interface
33 .Bl -tag -width "nmreplay"
36 .Op Fl i Ar netmap-interface
40 .Op Fl b Ar batch size
43 .Op Fl C Ar cpu-placement
50 to replay a pcap file through a netmap interface,
51 with programmable rates and possibly delays, losses
52 and packet alterations.
54 is designed to run at high speed, so the transmit schedule
55 is computed ahead of time, and the thread in charge of transmission
56 only has to pump data through the interface.
58 can connect to any type of netmap port.
60 Command line options are as follows
63 Name of the pcap file to replay.
65 Name of the netmap interface to use as output.
68 for interface name format.
71 .It Fl b Ar batch-size
72 Maximum batch size to use during transmissions.
74 normally transmits packets one at a time, but it may use
75 larger batches, up to the value specified with this option,
76 when running at high rates.
77 .It Fl B Ar bps | Cm constant , Ns Ar bps | Cm ether , Ns Ar bps | Cm real Ns Op , Ns Ar speedup
78 Bandwidth to be used for transmission.
80 is a floating point number optionally follow by a character
81 (k, K, m, M, g, G) that multiplies the value by 10^3, 10^6 and 10^9
84 (can be omitted) means that the bandwidth will be computed
85 with reference to the actual packet size (excluding CRC and framing).
87 indicates that the ethernet framing (160 bits) and CRC (32 bits)
88 will be included in the computation of the packet size.
90 means transmission will occur according to the timestamps
91 recorded in the trace.
94 multiplier (defaults to 1) indicates how much faster
95 or slower than real time the trace should be replayed.
96 .It Fl D Ar dt | Cm constant , Ns Ar dt | Cm uniform , Ns Ar dmin,dmax | Cm exp , Ar dmin,davg
97 Adds additional delay to the packet transmission, whose distribution
98 can be constant, uniform or exponential.
99 .Ar dt, dmin, dmax, avt
100 are times expressed as floating point numbers optionally followed
101 by a character (s, m, u, n) to indicate seconds, milliseconds,
102 microseconds, nanoseconds.
103 The delay is added to the transmit time and adjusted so that there is
104 never packet reordering.
105 .It Fl L Ar x | Cm plr , Ns Ar x | Cm ber , Ns Ar x
106 Simulates packet or bit errors, causing offending packets to be dropped.
108 is a floating point number indicating the packet or bit error rate.
109 .It Fl w Ar wait-link
110 indicates the number of seconds to wait before transmitting.
111 It defaults to 2, and may be useful when talking to physical
112 ports to let link negotiation complete before starting transmission.
116 creates an in-memory schedule with all packets to be transmitted,
117 and then launches a separate thread to take care of transmissions
118 while the main thread reports statistics every second.
125 .An Luigi Rizzo, Andrea Beconcini, Francesco Mola and Lorenzo Biagini
126 at the Universita` di Pisa, Italy.